[Bug 1934755] Re: Ubuntu server 20.04 installation will crash with http error 500

[shangsong]

Hi Jeff,
  So to confirm for BOTH 20.04 and 20.04.2, you are using the new Subiquity installer (The Ubuntu Server Live ISO available from ubuntu.com)?
==>Yes, both 20.04 and 20.04.2 use the LIVE ISO

Does the machine have internet access during installation?
==>Yes, it can access internet via http proxy.

The other thing, i can install the 20.04 via LIVE ISO successfully, but
not it fail with pxe installation

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Title:
  Ubuntu server 20.04 installation will crash with http error 500

Status in subiquity package in Ubuntu:
  New

Bug description:
  1.Install Ubuntu server 20.04 lts will crash with "
  subiquity/Refresh/apply_autoinstall_config: FAIL: 500 Server Error:
  Internal Server Error for url:
  http+unix://%2Frun%2Fsnapd.socket/v2/find?select=refresh"

  2.Ubuntu 20.04.2 can be install with the same environment
  successfully.

  Crash log:
  2021-07-05 06:07:41,667 DEBUG urllib3.connectionpool:396 https://geoip.ubuntu.com:443 "GET /lookup HTTP/1.1" 200 None
   2021-07-05 06:07:41,669 DEBUG urllib3.connectionpool:396 https://geoip.ubuntu.com:443 "GET /lookup HTTP/1.1" 200 None
   2021-07-05 06:07:41,673 DEBUG root:39 finish: subiquity/Mirror/lookup: SUCCESS: 
   2021-07-05 06:08:20,070 DEBUG urllib3.connectionpool:396 http://localhost:None "GET /v2/find?select=refresh HTTP/1.1" 500 264
   2021-07-05 06:08:20,074 ERROR root:39 finish: subiquity/Refresh/check_for_update: FAIL: 500 Server Error: Internal Server Error for url: http+unix://%2Frun%2Fsnapd.socket/v2/find?select=refresh
   2021-07-05 06:08:20,087 ERROR root:39 finish: subiquity/Refresh/apply_autoinstall_config: FAIL: 500 Server Error: Internal Server Error for url: http+unix://%2Frun%2Fsnapd.socket/v2/find?select=refresh
   2021-07-05 06:08:20,090 DEBUG subiquitycore.core:248 _exception_handler HTTPError('500 Server Error: Internal Server Error for url: http+unix://%2Frun%2Fsnapd.socket/v2/find?select=refresh',)
   2021-07-05 06:08:20,097 ERROR subiquitycore.core:688 Exception in controller.run():
   Traceback (most recent call last):
     File "/snap/subiquity/1772/lib/python3.6/site-packages/subiquitycore/core.py", line 686, in run
       self.urwid_loop.run()
     File "/snap/subiquity/1772/usr/lib/python3/dist-packages/urwid/main_loop.py", line 286, in run
       self._run()
     File "/snap/subiquity/1772/usr/lib/python3/dist-packages/urwid/main_loop.py", line 384, in _run
       self.event_loop.run()
     File "/snap/subiquity/1772/usr/lib/python3/dist-packages/urwid/main_loop.py", line 1484, in run
       reraise(*exc_info)
     File "/snap/subiquity/1772/usr/lib/python3/dist-packages/urwid/compat.py", line 58, in reraise
       raise value
     File "/snap/subiquity/1772/usr/lib/python3.6/asyncio/events.py", line 145, in _run
       self._callback(*self._args)
     File "/snap/subiquity/1772/lib/python3.6/site-packages/subiquitycore/async_helpers.py", line 26, in _done
       fut.result()
     File "/snap/subiquity/1772/lib/python3.6/site-packages/subiquity/core.py", line 374, in _apply
       await controller.apply_autoinstall_config()
     File "/snap/subiquity/1772/lib/python3.6/site-packages/subiquity/controllers/refresh.py", line 93, in apply_autoinstall_config
       await asyncio.wait_for(self.check_task.wait(), 60)
     File "/snap/subiquity/1772/usr/lib/python3.6/asyncio/tasks.py", line 358, in wait_for
       return fut.result()
     File "/snap/subiquity/1772/lib/python3.6/site-packages/subiquitycore/async_helpers.py", line 83, in wait
       return await self.task
     File "/snap/subiquity/1772/lib/python3.6/site-packages/subiquity/controllers/refresh.py", line 193, in check_for_update
       result = await self.app.snapd.get('v2/find', select='refresh')
     File "/snap/subiquity/1772/lib/python3.6/site-packages/subiquity/snapd.py", line 175, in get
       response.raise_for_status()
     File "/snap/subiquity/1772/usr/lib/python3/dist-packages/requests/models.py", line 935, in raise_for_status
       raise HTTPError(http_error_msg, response=self)
   requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: http+unix://%2Frun%2Fsnapd.socket/v2/find?select=refresh

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